DJ
David Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Hancock-County, Iowa
Our Model Tree links this David Johnson across the 1920, 1930 and 1940 US Censuses in Hancock-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1888), then head of a 4-person household.
Age 52
b. ~1888
Male
Head
Born: Sweden
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Hancock-County, Iowa |
| Surname | Johnson |
| Given Name | David D |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Boone twp |
| 1935 Residence (County) | Hancock |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | E |
| Hours Worked | 48 |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Iowa |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
| Occupation | Farmer |
| Township / Ward | Boone Twp |
| Est. Birth Year | ~1888 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to David | Age | Birth yr |
|---|---|---|---|---|
| David Johnson | Head | — | 52 | ~1888 |
| David Johnson | Son | — | 16 | ~1924 |
| Theodore Johnson | Son | — | 12 | ~1928 |
| Dagmar Johnson | Spouse | — | 47 | ~1893 |
Census Appearances
1920
Hancock, Iowa
Head, age 33
Hancock, Iowa · implied b. ~1887 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | David |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Sweden |
| Year of Immigration | 1905 |
| Naturalization Status | Naturalized |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Farmer |
| Industry | Gen Farm |
| Class of Worker | OA |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | R |
| Birth Country | Sweden |
| Year of Naturalization | 1915 |
| Birthplace (normalized) | sweden |
1930
Hancock, Iowa
Head, age 42
Hancock, Iowa · implied b. ~1888 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | David |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Sweden |
| Naturalization Status | Naturalized |
| Year of Immigration | 1905 |
| Age at First Marriage | 26 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Farmer |
| Industry | Gen Farm |
| Class of Worker | OA |
| Can Read/Write | Yes |
| Mother Tongue | Swedish |
| Home Owned/Rented | O |
| Veteran | No |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
1940
Hancock-County, Iowa
Head, age 52
Hancock-County, Iowa · implied b. ~1888 — 4 household members
| Surname | Johnson |
| Given Name | David D |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Sweden |
| 1935 Residence (City) | Boone twp |
| 1935 Residence (County) | Hancock |
| Naturalization Status | Naturalized |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | E |
| Hours Worked | 48 |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Iowa |
| Birth Country | Sweden |
| Birthplace (normalized) | sweden |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links David Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
David Johnson
Head · 1940 · age 52 · b. ~1888 · Iowa
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Hancock-County, Iowa
Open full size
1940 US Federal Census — Hancock-County, Iowa
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-01164-00709)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marie H Daughan | 36 | Wife | — | Iowa |
| 2 | Alonna Daughan | 16 | Daughter | — | Iowa |
| 3 | Eugene Daughan | 15 | Son | — | Iowa |
| 4 | Allan Daughan | 10 | Son | — | Iowa |
| 5 | Dale Daughan | 9 | Son | — | Iowa |
| 6 | Shirley Ann Daughan | 4 | Daughter | — | Iowa |
| 7 | Francis E. D. Daughan | 42 | Head | Farmer | Illinois |
| 8 | Marie A Daughan | 37 | Wife | — | Iowa |
| 9 | Adel M Daughan | 16 | Daughter | — | Iowa |
| 10 | Arlene I Daughan | 12 | Daughter | — | Iowa |
| 11 | Audrey A Daughan | 2 | Daughter | — | Iowa |
| 12 | Clark Riley | 38 | Head | Farmer | Iowa |
| 13 | Viola X Riley | 37 | Wife | — | Illinois |
| 14 | Glenn Riley | 14 | Son | — | Iowa |
| 15 | Wayne Riley | 12 | Son | — | Iowa |
| 16 | Edith Riley | 11 | Daughter | — | Iowa |
| 17 | Leo Riley | 10 | Son | — | Iowa |
| 18 | Jeanne Riley | 1 | Daughter | — | Minnesota |
| 19 | Naomi Balcom | 65 | Mother-in-law | — | Illinois |
| 20 | Todd May | 33 | Head | Farmer | Iowa |
| 21 | Daniel May | 3 | Son | — | Iowa |
| 24 | Joseph C. D. Geibel | 52 | Head | Farmer | Illinois |
| 25 | Vena Geibel | 42 | Wife | — | Illinois |
| 26 | Camilla Geibel | 6 | Daughter | — | Iowa |
| 27 | Carole Geibel | 6 | Daughter | — | Iowa |
| 28 | Mervin Aitchison | 24 | Head | Farmer | Iowa |
| 29 | Rosella Aitchison | 21 | Wife | — | Iowa |
| 30 | Shirley Ann Aitchison | 2 | Daughter | — | Iowa |
| 31 | Archie Cockrell | 37 | Head | Farmer | Illinois |
| 32 | Marietta Cockrell | 32 | Wife | — | Illinois |
| 33 | Clyde Cockrell | 15 | Son | — | Iowa |
| 34 | Bonnie Cockrell | 10 | Daughter | — | Iowa |
| 35 | Dean Cockrell | 5 | Son | — | Iowa |
| 36 | Paul L Cockrell | 2 | Son | — | Iowa |
| 37 | David D Johnson THIS PERSON | 52 | Head | Farmer | Sweden |
| 38 | Dagmar Johnson | 47 | Wife | — | Denmark |
| 39 | David Jr Johnson | 16 | Son | — | Iowa |
| 40 | Theodore Johnson | 12 | Son | — | Iowa |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)